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Rubber plug blew out of radiator, why and how to fix, wife stranded 200 1993

Pressure is relieved from the expansion tank cap. I think they often go bad. There are two caps I think, green and black. I "think" the pressures are different but individuals suggest to replace with the black one. Cheap at fcpgroton.
I replaced all of mine with black (3 cars) for preventative purposes.

Not sure what else can cause excess coolant pressure. Don't overfill.

Might as well replace t-stat and do a good flush in case the t-stat got stuck and caused too much heat...

Greg






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